What happens when Class D airspace is not continuous?

As a rule of thumb, during the hours the tower is not in operation, the Class D surface area becomes Class E surface area or a combination of Class E to 700' above ground level and Class G to the surface, but this varies with each airport so you'll need to consult the chart supplement.



When Class D airspace is designated as part-time, the airspace reverts to a different classification during the hours the control tower is not in operation. According to 2026 FAA Chart Supplements, a Class D surface area typically reverts to either Class E surface area or Class G airspace (uncontrolled) up to the base of the overlying controlled airspace. If it becomes Class E, it remains controlled airspace, meaning weather minimums for VFR flight (3 miles visibility, distance from clouds) still apply, and IFR aircraft still require a clearance. If it reverts to Class G, it becomes uncontrolled; pilots must use a Common Traffic Advisory Frequency (CTAF) to self-announce their positions, and weather minimums are more relaxed. This "non-continuous" status is vital for pilots to verify, as it changes communication requirements and legal flight visibility. Pilots should always check the "NOTAMs" or the Chart Supplement to confirm whether a tower is "active" or "reverted" before entering the terminal area.

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Restrictions in Class D airspace Minimum visibility requirements of 3 statute miles. Cloud clearance minimums are 500 feet below, 1,000 feet above, and 2,000 feet horizontally. No VFR flights if ceiling is less than 1,000 feet AGL.

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Controlled and uncontrolled airspaces are the ones you will spend most of your time flying within as a pilot. Controlled airspace consists of five tiers beginning with most restrictive to least restrictive: Class Alpha (A), Class Bravo (B), Class Charlie (C), Class Delta (D), and Class Echo (E).

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In general, Class D airspace extends upwards from ground level to 2,500 above the airport elevation, with a radius of 4NM from the Class D airport. Each Class D area is individually tailored, and normally contain instrument procedures for IFR landings.

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Class G airspace (uncontrolled) is that portion of airspace that has not been designated as Class A, Class B, Class C, Class D, or Class E airspace. Rules governing VFR flight have been adopted to assist the pilot in meeting the responsibility to see and avoid other aircraft.

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As an FAA-certified remote pilot under the Part 107 regulations, if you need to operate in Class B, C, D, or E airspace, you need to get prior approval to operate in that airspace.

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Class D. IFR and VFR flights are permitted and all flights are provided with air traffic control service, IFR flights are separated from other IFR flights and receive traffic information in respect of VFR flights, VFR flights receive traffic information in respect of all other flights.

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For flights near airports in uncontrolled airspace that remain under 400' above the ground, prior authorization is not required. When flying in these areas, remote pilots and recreational flyers must be aware of and avoid traffic patterns and takeoff and landing areas.

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The main requirements for operating within Class D airspace are to have a functional two-way radio and to establish two-way communication with ATC prior to entering the airspace. Pilots must also meet all of the established weather minimums and obey speed regulations.

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Without ADS-B Out, you can fly in any airspace except the ADS-B rule airspace defined by FAR 91.225 (see above). Note that ADS-B is not required in Class D airspace, or under a Class B or Class C airspace shelf, unless it lies within a Mode C veil.

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(b) Unless otherwise authorized or required by ATC, no person may operate an aircraft at or below 2,500 feet above the surface within 4 nautical miles of the primary airport of a Class C or Class D airspace area at an indicated airspeed of more than 200 knots (230 mph.).

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Remote ID also helps the FAA, law enforcement, and other federal agencies locate the control station when a drone appears to be flying in an unsafe manner or where it is not allowed to fly.

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CBO operations and events occurring at 400 feet AGL and below in Class G airspace do not require FAA review, approval or authorization. CBO's intending to conduct events in Class G airspace that may exceed 400 feet AGL must contact the FAA for further information.

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At a Class D airport, if the radio failed prior to making initial contact, stay out of the Class D and land at a non-towered airport.

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